Towards Sustainable Cities trough a Decrease in CO<sub>2</sub> Emissions Based on Creating Consciousness on Human Habits and Its Relations to Body CO<sub>2</sub> Emissions and Associated Impacts : Table 1

Table 1: Gas exchanges in the breathing system.

Parameter	units	Inspired air	Expulsed air
O₂	% vol	20.93	15.26
CO₂	% vol	0.04	3.42
N₂	% vol	78.53	75.13
H₂O	% vol	0.50	6.19
Breathing rate	times/min	15.0	15.0
Temperature	°C	21.0	36.0
Gas density at 1 atm	kg/m³	1.193	1.125
Volume in each breathing	m³	0.00060	0.00066
Mass flow	kg/hr	0.644	0.667
O₂ flow	kg/hr	0.15	0.11
CO₂ flow	kg/hr	0.00039	0.03519
N₂ flow	kg/hr	0.49	0.49
H₂O flow	kg/hr	0.0020	0.0261